APPENDIX TABLE.

Probability of Missing by Original Youth Development Study Cohort Smoking Trajectories for Each Survey Year

	1988	1989	1990	1991	1995	1998	1999	2000	2009	2011
Trajectory 1: early-onset light smokers who quit/reduce	0.022	0.053	0.028	0.062	0.223	0.153	0.192	0.171	0.261	0.278
Trajectory 2: late-onset persistent smokers	0.075	0.060	0.022	0.000	0.100	0.085	0.156	0.114	0.254	0.309
Trajectory 3: early-onset persistent heavy smokers	0.060	0.063	0.053	0.066	0.147	0.123	0.184	0.128	0.353	0.337
Trajectory 4: stable-nonsmokers	0.037	0.040	0.013	0.015	0.077	0.084	0.105	0.048	0.179	0.222
Trajectory 5: high probability of attrition	0.110	0.218	0.211	0.297	0.751	0.879	0.943	0.920	0.792	0.766